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If you have the Microsoft audio kernel driver installed on your system, this guide may help you.

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In This Article

WDMAud System Driver

The WDMAud kernel-mode system driver (Wdmaud.sys) coordinates with the user-mode WDMAud airport taxi driver (Wdmaud.drv). The WDMAud paired drivers force the call ranges of the Microsoft Windows multimedia system to user mode in conjunction with kernel stream I / O requests. Run wdmaud I / O with the following APIs in mind: waveIn, waveOut, midiIn, midiOut, Mixer and Aux (described in the Microsoft Windows SDK documentation). and also the client of the SysAudio process driver.

SysAudio System Driver

The SysAudio system driver (Sysaudio.sys) develops filter circuits that render and recognize audio content. The SysAudio driver renders MP3 filter diagrams as virtual audio devices , meaning it registers each virtual audio device as it can A single instance of the KSCATEGORY_AUDIO_DEVICE interface device. (Actually, adapters don’t have to fit into this category of approach, which is exclusively for SysAudio.) For example, a virtual midi device can optionally represent a filter graph that is created by connecting a SWMidi driver, a KMixer driver, and a port / miniport driver. The customer only communicates with the virtual audio device and not with the individual devices that make up the virtual audio device. For the client, SysAudio configures drivers for all KS filters in the block graph that are linked to each other so that they appear as a virtual audio device. Track sources of audio streams, use graphics created by SysAudio:

• DirectSound (see the Microsoft Windows SDK documentation.)

• Windows Multimedia WaveIn, apis waveOut, midiIn, midiOut, Mixer combined with Aux (see Windows SDK documentation)

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  Audio from digital cameras Redbook CD (see the Redbook system driver.)

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  Sound Blaster Emulator (see SBEmul system driver)

• Kernel-mode soft keyboards (see System drivers SWMidi and Systemnew DMusic drivers.)

• DRMK system driver

KMixer System Driver

The KMixer Golf System Driver (Kmixer.sys) is a KS filter that does the following:

• Mixing multiple PCM audio streams

• Converting high quality format

• Bit depth conversion

• Speaker configuration and mode assignment

In addition to simple 8- and 16-bit data formats, mono and therefore also stereo, KMixer supports:

• PCM Driver and IEEE Floating Point

• More than 16 bit bit depth and multi-channel formats on two channels

• 3D Handling of Head-Related Transfer Events (HRTF)

You can find information about the default volume and volume levels in different versions of Windows under Default audio volume settings .

Redbook System Driver

The Redbook System User (Redbook.sys) is a ks filter for playing digital audio CDs. The Redbook driver is often a client of the SysAudio system driver. System successfullytransfers CDs digitally through the audio file system to the Redbook driver and then to this SysAudio driver. The supplied digital audio CD uses the preferred audio output technology (as defined in the online media property in the control panel).

SBEmul System Driver

The SBEmul device driver (Sbemul.sys) provides Sound Blaster emulation for use with MS-DOS applications. The SBEmul driver is a SysAudio system driver application. To render and save SysAudio content, the operator uses the preferred Wave and MIDI devices (as defined on the media properties web page in the control panel).

SWMidi System Driver

The SWMidi System Driver (Swmidi.sys) is a KS filter that not only offers high quality Roland GS wavetable synthesis, but also emulates General MIDI (GM) in software. SWMidi uses the midiOutXxx request when a hardware synthesizer is almost certainly not available. The SWMidi filter accepts input such as a time stamped MIDI stream from the WDMAud system driver and outputs the PCM viewer stream to the KMixer system driver. SWMidi internallycombines all of its voices to help you form a single 2-channel PCM output stream. to support the waveform format.

DMusic System Driver

The DMusic System Driver (Dmusic.sys) is a KS purify that supports Software Emulated Loadable Synthesis (DLS). The DMusic driver is simply a miniport port class driver supplied by the system. It provides another single DirectMusic contact that supports any DirectMusic streaming area . The DMusic filter is input as a MIDI time stamped stream outside the DirectMusic system component and outputs a large waveform PCM stream to the KMixer exercise driver. DMusic, the pilot mixes all his vocals internally to form the main 2-channel surfing PCM output stream. DirectMusic must explicitly specify a kernel-mode software synthesizer, Dmusic.sys, in order to work with it instead of the standard DirectMusic user-mode synthesizer.

AEC System Driver

The AEC System Operator (Aec.sys) supports DirectSound full duplex through applications that implement Acoustic Echo Cancellation (AEC) and noise reduction software. See DirectSound capture effects .

for more information

DRMK System Driver

The DRMK Taxi System Driver (Drmk.sys) is a KS filter that decrypts audio quality streams with DRM protected content. For more tips, see Digital Rights Management .

System Separator Driver

The system splitter driver (Splitter.sys) is a KS filter that creates two or more output fields from a single capture input stream. The driver splitter transparently copies the input stream into two additional output streams, regardless of the format of the input stream.

The splitter driver is supported by Microsoft Windows XP and later. For more information see AVStream Splitter .

Port Class Adapter Driver And PortCls System Driver

The port adapter class driver uses some type of port / miniport driver architecture to support the audio track device. The driver ports contain built-in user support for audio electronics.Onics ISA and PCI. Although the PortCls system driver (Portcls.sys) also provides the infrastructure for vendor-supplied port class adapter drivers, Microsoft recommends that vendors use a vendor-provided port class adapter driver that supports ISA and PCI audio devices. The PortCls platform can also be useful for drivers designed for audio devices on multiple hardware buses or for pure software devices. For more information, see Introducing the Port Class .

USB Audio Class System Driver (Usbaudio.sys)

The System Driver for USB Audio Training Session (Usbaudio.sys) provides driver support for USB audio devices that conform to the device class definition for Universal Serial Bus with Audio Devices. For more information on this system class driver, see USB Audio Class System Driver (Usbaudio.sys) .

System AVCAudio Class Driver

The AVCAudio class system driver (Avcaudio.sys) is AVStream, a special mini driver that supports drivers for common museson the IEEE 1394 bus. Basic information about the IEEE 1394 audio device related to AVCAudio and driver is available in Windows XP and later.

In order to work with system-supplied drivers, hardware vendors must configure their audio devices according to your sections, which comply with the following specifications:

• IEC 61883-1 or IEC 61883-6 (IEC 60958)

• Digital AV / C Interface Command Set General Specification Ver. 3.0

• AV / C 1.0 Audio Subunit Specification

• Connectivity and Compatibility Management Specification 1.0

• Information and agreement of the AV / C media stream format

• Ongoing AV / C Audio Subset Specification Updates

These specifications are described on the IEEE General 1394 Wiki page. The AVCAudio driver supports a subset of the core functionality described in these specifications.

If a great audio device identifies itself as an IEEE Audio 1394 compliant device when listing Plug and Play devices, the system will automatically load your current AVC audio driver to control the device. AVCAudio controls the device without the direct help of a proprietary adapter driver. This may mean that a device that normally complies with the relevant IEEE 1394 specifications does not need a personal adapter driver.

Microsoft recommends that hardware vendors use the AVCAudio driver for IEEE 1394 audio devices instead of writing proprietary card drivers.

The following illustration shows the driver as an IEEE 1394 audio device hierarchy for Windows XP. Under Windows XP and possibly all driver components are displayed if this image is provided by Microsoft with the operating system.

For more information on the driver components in the figure, see the following sections:

Speed up your computer today with this simple download.